Can you think of any three-dimensional shape that comprises of exactly two surfaces?

A man is shown a portrait painting. He looks closely, then tells, “Brothers and sisters have I none, but that man’s father is my father’s son!” Who is the man in the portrait?

I can write cow in 13 letters.

Can You?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

In a rainy season, one day 3 huge ladies walked under a normal-sized umbrella.
The umbrella is not huge enough to accommodate all 3 ladies yet not a single lady got wet. Why?

What is 3/7 chicken, 2/3 cat and 2/4 goat?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

Can you make the below equation true by using any three numbers from "1, 3, 5, 7, 9, 11, 13 and 15"?

( ) + ( ) + ( ) = 30

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?